Tire building machines with expansible tire building drum



Feb. 18, 1964 N.A.BoRG1 xN ETAL 3,121,652

TIRE BUILDING MACHINES WITH ExPANsIBLE TIRE BUILDING DRUM 7 Sheets-Sheet1 Filed Feb. 3, 1961 I. u I l l 1 l u l I NV EN T035 Nus AA BORGUN amANDERS m. e; APPELUREN ATTORNEYS Feb- 18, 1964 N. A. BORGLIN ETAL3,121,652

TIRE BUILDING MACHINES WITH EXPANSIBLE TIRE BUILDING DRUM '7Sheets-Sheet 2 Filed Feb. 5, 1961 INVENTOP NILS A. BORGUN MD ANDERS m.EAPPELGREM Feb. 18, 1964 N. A. aoRGLlN ETAL. 3,121,652

TIRE BUILDING MACHINES WITH EXPANSIBLE TIRE BUILDING DRUM Filed Feb 51961 '7 Sheets-Sheet 3 /NvENToRs NILS ABORGLIN @we ANDERS M.E.APPELGREN@Y @MQW *52M I 2 4 o G 5 .T L vf 5 t .N E E E F N 1. W h v 0.0M R m Dn.M NH. 0 Qw Nu n //7/ f4/41f/A/N/WWAA? M. W .m 1 1 l 1 1 l l 1 l 1 1 11S 1 A L s Q 1 m 7 @N w. M f B \/o-m N m N NN A I mw i w L T UQ QN @N m52NN A E m. U s G N ^N. m R w/ u m m V). G E |1111-- 11111 111| 1111 1 R Hwm A O H 1 1111 1 11 1 1 s B W mv L A. 1 N N N M oq mm wn NN 111 1 11,;1 11 3 NN G m mm Nv NN N NN s 111% n m di oq m\|gm M w m .111111 2 .01um 3, /Vv /wf/ WV T m, m i n.3 K Q .s n.3 D.; d w m F m Feb. 18, 1964 N.A. BORGLIN ETAL TIRE BUILDING MACHINES WITH EXPANSIBLE TIRE BUILDINGDRUM Filed Feb. 5, 1961 31 Mb 71 sa 55 I 33h -I L... E 7U F163 31 70 lLb/440 68 7; 65

FIG.5

7 Sheets-Sheet 5 N115 ABORGLIN MANDERS NLE. APPELGREN @y M, WMM/f6 ATTORN HYS Feb. 18, 1964 N, A. BORGLIN ETAL. 3,121,652

TIRE BUILDING MACHINES WITH EXPANSIBLE TIRE BUILDING DRUM Filed Feb. 5.1961 7 Sheets-Sheet 6 INVENTORS NILS A. BRGUN awANDERS M.E,APPELGREN @YWMM* M A TTOHNEYS Feb, 18, 1964 N. A. BORGLIN I-:TAL 3,121,652

TIRE BUILDING MACHINES WITH ExPANsIBLE TIRE BUILDING DRUM Filed Feb. 3,1961 7 Sheets-Sheet '7 FIG.7

78 1017 10219' 102@ Lb K71 IN VENTORS NlLS ABORGLIN mw ANDERS NLEAPPELGREN BYWWIMIM ATTORNEYS United States Patent 3,121,652 TIREBUILDING MACHINES WITH EXPANSIBLE TERE BUILDHNG DRUM Nils Axel Borgiinand Anders Mats Erik Appelgren,

Trelleborg, Sweden, assignors to Trelleborgs Gummifabriks Aktiebolag,Trelleborg, Sweden, a corporation of Sweden Filed Feb. 3, 1961, Ser. No.87,039 Claims priority, appiication Sweden Feb. 9, 1960 3 Claims. (Ci.156-400) This invention relates to tire building machines with anexpansible tire building drum carried by a shaft laterally extendingfrom a frame and with two tire ply fabric folding or turnover drumsdisposed coaxially with the tire building drum on either side thereof,and shifting means for telescopically moving said fabric turnover drumsinwards over the tire building drum for turning the marginal portions ofcord fabric plies wrapped around the three drums over bead wire ringswhich have been placed around the cord fabric plies adjacent the ends ofthe tire building drum.

In previously known tire building machines of this type the fabricturnover drum remote from the frame and the cooperating shifting meanshave been mounted with the aid of supporting means at the end of thedrum remote from the frame of the shaft carrying the tire building drumso that the respective fabric turnover drum had to be pushed or swungaway from the tire building drum to permit mounting Prefabricated beadwire rings on the tire building7 drum and to permit removal of afinished tire from the machine. To push or swing a fabric turnover drumaside in such a way is a timeconsuming operation which makes for abulky, and usually also complicated and expensive construction. Also,the bead wire mounting means, if such are used, will be of expensive andcomplicated construction since these bead wire mounting means must beable to move both radially and axially relative to the tire buildingmachine.

The present invention eliminates these disadvantages by an arrangementin which the shaft carrying the tire building drum is tubular and a pushrod operable by the shifting means mounted on the frame or one of theseshifting means extends through the shaft and is coupled to the fabricturnover drum remote from the frame in such a way as to carry along saiddrum axially. By this arrangement the drum assembly composed of the twofabric turnover drums and the tire building drum will extend freely incantilever fashion from one side of the frame, thus having one endfreely accessible as in tire building machines of another type with anon-expansible tire building drum, so that the prefabricated bead wirerings can, without diiiiculty, be passed onto the drum assembly from thefree end thereof and the finished tire can be removed over said free endof the drum assembly.

For a better understanding the invention will be described more indetail in the following reference being made to the accompanyingdrawings which illustrate an embodiment of the invention. In thedrawings:

FIGS. 1A, 1B and 1C together show a vertical section of a tire buildingmachine according to the invention, FIGS. 1A and 1B connecting to eachother on the dash and dot line AB and FIGS. 1B and 1C on the dash anddot line BC;

FIG. 2 shows a vertical section through a tire building drum, on alarger scale;

FIG. 3 shows a vertical section of a fabric turnover drum, on a largerscale;

FIG. 4 shows a section on line IV-IV in FIG. 3;

FIG. 5 shows a vertical section corresponding to FIG. 3,

e ICC but with the fabric turnover drum partly telescoped inwards overthe tire building drum;

FIG. 6 shows the fabric turnover drum as seen from the right in FIG. 5;

FIGS. 7-10 diagrammatically show different stages of the building of atire in the machine.

The tire building machine illustrated in the drawings comprises a framegenerally designated 11 and two end walls 11a and 11b. The machine framecan be of any construction whatever although it is shown in the drawingssubstantially as an angle-iron framework. The machine frame 11 supportstwo roller bearings 12, 13 rotatably mounting a tubular shaft 14 on theframe. One end of the shaft 14 extends laterally from the frame end Wall11b, and secured to the other end of the shaft is a pulley 15 which isconnected by V-belts 16 to the pulley 17 of a drive motor 18 on saidframe 11, by means of which the shaft 14 can be rotated.

Non-rotatably secured to the end of the shaft 14 extending from theframe end wall 11b is a sleeve 19 which has a central portion 19a with asmooth outer side. 0n either side of the central portion 19a the sleeve19 has external threads 19]: and 19e which are opposite in direction.Non-rotatably secured to the portion 19a is a locking ring 20 which hasa plurality of locking recesses 21 evenly distributed around the outercylindrical circumference of the ring 20. The locking ring 20 issurrounded by a locking ring 22 which is rotatable relative to the firstlocking ring 20 and secured by setscrews 24 to rods 23 extending throughsaid second ring 22. Although but one rod 23 is shown in FIGS. 1C and 2,the embodiment illustrated has three rods distributed around the shaft14 at a spacing of 120. For locking the ring 22 and thereby the rods 23to the ring 20 and consequently the shaft 14 at least one locking pin 25is mounted in said second ring 22. Said locking pin 25 can be caused toengage in any one of the locking recesses 21 in said rst ring 20. Whenthree rods 23 are provided there are preferably also three locking pins25 mounted in the second ring 22 between said rods. Each locking pin 25is fixed to a piston 26 which is movable in a cylinder 27 in the lockingring 22. A pressure spring 28 interposed between the piston 26 and acylinder cover 29 tends to urge the locking pin 25 into engagement witha locking recess 21 in the first ring 20. By supply of air underpressure or other pressure medium through a pipe connection 30 to theradially inner end of the cylinder 27 the piston 26 can be movedradially outwards against the action of the spring 28 to withdrawbetween the pin 25 from the locking recess 21 so that the shaft 14 canbe rotated without carrying along the locking ring 22 and the rods 23.

The locking ring 22 and the rods 23 are parts of a hub structure 4for anexpansible tire building drum generally designated 31 and to bedescribed more in detail in the following. This hub structure includestwo sleeves 32 and 33 which extend coaxially from the drum ends and thefacing ends `of which have end lianges 34 and 35 respectively. These endflanges 34 and 35 are iixedly connected with each other and -with thelocking ring `22 by means of the rods 23 in the manner apparent fromFIGS. 1C and 2. The sleeve 32 is rotatably mounted on the shaft 14 by abushing 36 and on the sleeve 19 by a bushing 37. In proximity to the endflange 35 the sleeve 33 is rotatably mounted on a bearing member 38 butotherwise of the cantilever type. The bearing member 3S is secured tothe end of the shaft 14 by screws and simultaneously serves to retainthe lsleeve 19 on the shaft 14.

Engaging with the threads 191) and y.19e of the sleeve 19 are two guidemeans 39, `40 -which are displaceable on the rods 23 and have guidegrooves of dovetail cross arance-2 section in an oblique position to theaxis of the shaft 14 and the adjacent ends of which are closest to theshaft 14. Guide ribs `41 and 42 are arranged in a corresponding obliqueposition on bars 43 and movably engage in the guide grooves of saidguide means 39, 4t). On each of said bars 43 there is fixed a merelydiagrammatically indicated segrnent 44 of prior-art construction. Forgreater clarity the contours of the successive segments 44 and bars 43behind the plane of the section have not been shown in FIGS. 1C and 2;however, in the embodiment illustrated there are eight bars `43 andsegments 44. The axially directed segments 44 in a manner known at eachend have a shallow channel `44a and a deep channel 445 for a purpose tobe described in the following. The segments 44 together form anexpansible tire building drum which has its smallest diameter when theguide means 39', 40 are most remote from each other, asis shown in FIGS.1C and 2. By rotation of the shaft 14 in the manner described in thefollowing in relation to the guide means 39, 40 said means can bescrewed towards the locking ring 20 due to the threads 19b and 19e.During this movement the guide ribs 41, 42 of the bars `43 will slide inthe grooves of the guide means 39, 4b, while the segments y44 are movedradially away from the shaft 14- so that the diameter of the tirebuilding drum increases. During their movement the bars y43 are alsoguided in that guide means 45 on the one `ends of the bars engage inradial guide grooves 34a in the end flange 34 of the sleeve 32 and withthe two lateral surfaces of the flange 34 so that they can move radiallyrelative to the shaft 14 but are prevented from moving axially of theshaft 14.

A tubular push rod y46 is axially movable in the tubular shaft 14. Oneend of the push rod 46 -projects through the end of the shaft 14 in themachine frame (FIG. 1A) and extends displaceably through the end -wallsof a pressure medium cylinder, e.g. a compressed-air cylinder 47, whichis secured to the frame 11. `In the cylinder 47 the rod 46 is nxedlyconnected to a piston 48 movable in said cylinder, the push rod 46 thusforming the piston rod. The free end of the rod 46 extending from thecylinder 47 carries a ring `49 which is lixedly connected thereto andfrom which a pin 50 projects. Said pin 56 is movable in a guide slot S2in a bracket 53- secured to the cylinder 47. The piston rod 46 ismounted for rotation in the shaft 14 by means of bushings 55 (FIG. 1A)and 56 (FIG. 1C) and the pin Sil engaging in the guide` slot 52 preventsthe piston rod 46 taking part in the rotation of the shaft 1-4.

The opposite end of the piston rod 46 from the piston 48 extends fromthe shaft y14 through the bearing member 38 and freely extends throughthe sleeve 33 which outside thc bearing member 33 is divided into eightarms by axial slots. On the last-mentioned end of the piston rod 46 isrotatably mounted a hub 53 for a fabric turnover drum generallydesignated 71 by means of two roller bearings (FIG. 1C, omitted in FIGS.3 and 5 for greater clarity). The hub S is movable in the space insidethe eight arms of the sleeve 33 and has eight arms 59 which extendthrough the slots between the sleeve arms and outside said arms carry aring 6b which supports a substantially circular disk 61 forming the bodyof the fabric turnover drum 71. Provided in the circumference of thedisk -61 are eight guide slots 62 in which eight slides 63 are radiallymovable. The radially inner ends of said slides 63 are hingedlyconnected each to one cam follower 64 which is radially movably mountedin the disk 61 and the ring 66. A spring `67 tending to hold the camfollower `.64 engaged with the outside of the respective arm of thesleeve 33, is interposed between a pin 65 on each slide 63 and a pin onthe ring 66. The outer end of each slide 63 is connected at one end-with a sheet metal segment 63, and the eight segments 68 togetherconstitute the shell of the fabric turnover drum v71. At the end opposedto the slides 63 each segment 68 has a pivot bearing 69 for 4 anchoringthe facing ends of two prior-art stitcher springs B while permittingrotation of said ends. The eight stitcher springs 70 thus connect thedrum shell segments 63 resiliently together and the segments 63 restwith said springs 76 on the shell of the tire building drum 31. When thepiston rod `46 occupies the position shown in FIGS. 1A, 1B, 1C and 3, inwhich position the hub 58 of the fabric turnover drum 71 is at the freeend of the sleeve 33, the stitcher springs 70 rest in one shallowchannel `44a in the shell of the tire building drum 31. When the pistonrod 46 moves to the left as seen in FIGS. 1C and 3 the hub 5h and thusthe entire fabric turnover drum 71 is carried along the stitcher springs76 rolling inwards over the shell of the tire building drum 31 (or, as-will be described in the following, over the plies wrapped around saiddrum). An intermediate stage of such a shifting movement is shown inFiGS. 5 and 6. In the initial position according to FIGS. 1C, 3 and 4the inner ends of the cam followers 64 are supported on` narrow endportions 33a of the arms of the sleeve 33 so that the slides `63 arealmost entirely drawn into the guide slotsV 62 in the disk 61 and theshell of the fabric turnover drum 7K1 formed by the segments 63 hassubstantially the same outer diameter as the shell of the tire buildingdrum 31 occupying collapsed position according to FIGS. 1C and 2. At thebeginning of the telescoping movement of the fabric turnover drum 71inwards over the tire building drum 31 the inner ends of the camfollowers 64 slidev in an upward'direction on inclined portions or ramps33b of the arms of the sleeve 33 so that the slides 63 are movedradially outwards lwhereby the segments 63 of the fabric turnover drum71 are moved apart until the fabric turnover drum 71 has obtained aslightly larger outer diameter than the shell of the expanded tirebuilding drum Sill, as will appear from FIGS. 5 and 6.

The end of the tubular piston rod 46 extending from the cylinder 47(FIG. 1A) is connectible to a source (not shown) of -air under pressureor other pressure medium which is conveyed by the piston rod 46 to achamber 72 (FIG. 1C) in a cover assembly 73 for the hub 58 of the fabricturnover drum 71. Said cover assembly 73 and the piping described in thefollowing are shown only in FIG. 1C, they have been omitted from FIGS.2-6 for greater clarity. Extending from the chamber 72 of the coverassembly 73 is an axially directed pipe 74 which inthe interior of thefabric turnover drum 71 is connected by means of a hose 75 to an annularmanifold 76 surrounding the sleeve 33 and connected by pipes 77 to thepipe connections 30 of the three locking cylinders 27 (FIGS. 1C and 2).By supply of pressure medium to the tubular piston rod 46 the engagementbetween the locking ring 22 of the tire building drum 31 and the lockingring 2i) secured to the sleeve 19 of the shaft 14 can thus be broken.When the locking rings 20 and 22 are looked together, the tire buildingdrum 31 can be rotated by the motor 18, and the fabric turnover drum 71is carried, along in this rotation by the arms of the sleeve 33 engagingthe hub arms 59 of the fabric turnover drum 71. By said engagementbetween the arms 0f the sleeve 33 and the arms 59 of the hub 58 thefabric turnover drum 71 is always nonrotatably coupled to the tirebuilding drum 31.

A fabric turnover drum generally designated 78 and fully correspondingto the earlier described fabric turnover drum 71 except for its hubconstruction is movably but non-rotatably mounted on the sleeve 32between the tire building drum 31 and the fname end wall 11b. The hub ofthe drum 73 is constituted by a ring 79 which is movable on, but keptnonrotatable relative to, the sleeve 32 by pins (not shown for greaterclarity of the drawings) which from the inner side of the ring 79 engagein axial, guide grooves in the outer side of the sleeve 32. Asubstantially circular disk 3i) of the same construction as the disk 61of the fabric turnover drum 71 is secured to the ring 79 and in recessesprovided in the circumference of the disk 80 slides 81 are radiallymovable. Said slides correspond to the earlier described slides 63 ofthe fabric turnover drum 71. The slides 81 are connected to the one endsof segments 82 forming the shell of the fabric turnover drum 78, and theother e-nds of said segments 82 bear Iagainst the tire building drum 31with stitcher springs 83-all in conformity with that earlier describedin connection with the fabric turnover drum 71. The slides 81 arehingedly connected to cam followers 84 mounted in the disk 80 and heldpressed like the cam followers 64 of ythe fabric turnover drurn 71against the sleeve 32 by springs 85. In the initial position shown inFIGS. 1B and 1C the cam followers 84 are held against the deepestportion of grooves 86 in the sleeve 32 so that the outer diameter of thefabric turnover drum 7S substantially corresponds to the outer diameterof the tire building drum 31 occupying collapsed position. The fabricturnover `drum 78 can be telescoped inwards over the tire building drum31 in the manner described in the following, and at the beginning ofthis movement the cam followers 84 slide out of the grooves 86 onto theouter circumferential surface of the sleeve 32, the fabric turnover drum78 being expanded in the same way as the fabric turnover drum 71 to yanouter diameter slightly greater than the outer diameter of the tirebuilding drum 31 occupying expanded position.

To permit displacement of the fabric turnover drum 78 the hub ring 79thereof carries a ball bearing 87 by means of which an annular dog 88 isrotatably but axially non-movably connected to the fabric turnover drum78. 'I'he annular dog 88 is xedly connected to a piston rod 89, thepiston 90 of which is movable in a cylinder 91 for air under pressure orother pressure medium, mounted on the frame 11. By admission of pressuremedium to one or the other end of the cylinder 91 through connectionapertures 92, 93 the fabric turnover drum 78 can thus be moved in one orthe other direction on the sleeve 32.

For retaining the drums 31, 71 and 78 against rotation relative to theframe 11 the sleeve 32 is provided, between the annular dog 88 and theframe end wall 11b, with `a brake disk 94 which is secured to the end ofthe sleeve and the marginal portion of which is clamped by a frictionbrake. This brake consists of a body 95 which is non-rotatable butmovable in the frame 11 tow-ard and away from the fabric turnover drum78, said body having a hold-up jaw 95 extending into the space betweenthe brake disk 94 and the fabric turnover drum 78. A brake shoe 97 ismovable in said body 9S toward and away from the brak-e `disk 914 by theaction of an operating rod 98 which is secured to a diaphragm in ahydraulic or pneumatic control apparatus 99 of a previously known typewhich is connectible to a source of pressure medium (not shown). Boththe holdup jaw 96 and the brake shoe 97 may have a brake lining 100 toincrease the friction against the disk 94. By means of the controlapparatus 99 the br-ake disk 94 can thus be clamped between the brakeshoe 97 and the jaw 96 so that it is held to the frame against rotation.The sleeve 32 and the tire building drum 31 are thus locked. The hubring 79 being non-rotatably connected to the sleeve 32, the fabricturnover drum 78 also is locked. The sleeve 32 being nonrotatablyconnected to the sleeve 33 by means of the rods 23, and the arms `ofsaid sleeve engaging the arms 59 of the hub 50, the fabric turnover drum71 also is locked.

When a tire is to be built in the machine described in the foregoing,the parts first occupy the position shown in FIGS. lA-lC i.e. the tirebuilding drum 31 and the fabric turnover drums 71, 78 are collapsed totheir smallest diameter and connected by the locking mechanism 20, 22 tothe motor-driven shaft 14, the brake 95-100 being released. Duringrotation of 'the drums 31, 71 and 78 for instance, two plies of cordfabric are first wrapped cover the entire tire building drum 31 and,with its marginal portions, also part of each fabric turnover drum 7l,78. In FIG. 7 the cord fabric plies are indicated by dotted lines 101.Then two prefabricated bead wire rings 102 (FIG. 7) are passed over thefree end of the fabric turnover drum 71 and moved in over the tirebuilding drum 31 to a position lopposite their respective grooves 44b inthe shell of the tire building drum 31. Although the mounting of thebead wire rings can be done by hand the use of a special apparatus forthis purpose is recommended. The previously known bead wire mountingapparatuses may be used although their construction may be simplified`since they need not move the bead wire rings at right tangles to, butonly along, the axis of the drums 31, 71, 78.

After the wire bead rings IGZ-the inner diameter of which is `slightlylarger than the outer diameter of the plies 101 wrapped around thedrums-have been brought into position opposite the respective grooves44b in the tire building drum 31, pressure medium is supplied to thecylinders 27 of the locking mechanism through the piston rod 46 and thepipings 74-77 so that the locking pins 25 are disengaged from thelocking ring 20 and the drums 31, 7`1, 78 are thereby released from theshaft 14.. At the same time the brake 95--100 is supplied with pressuremedium so that the disk 94 and thus the drums 31, 71, 78 are braked andheld against the frame 11. The motor 18 is now caused to rotate theshaft 14 in such a direction that the guide means 39, 40 are movedtowards one another under expansion of the tire building drum 31. Duringthis expansion the plies 101 are moved towards the wire bead rings 10Qlwhich consequently penetrate into the grooves 44h in the tire buildingdrum. This stage is illustrated in FIG. 8. The bead wire rings 102 arenot resilient and therefore limit the expansion of the drum 3-1. Aftersufficient expansion of the tire building drum 31, pressure medium iswithdrawn from the cylinders 27 of the locking mechanism so that saidmechanism again connects the drums 31, 71, 78 with the shaft 40 thusretaining the drum 31 in the expanded state. The brake 95-'100 is alsoreleased. Pressure medium is then supplied to the cylinder 91 throughthe connection aperture 92. This will cause the piston to telescope thefabric turnover drum 78 inwards over the tire building drum 31, thestitcher springs 83 roll-ing out of the grooves 44a in the tire buildingdrum 31 and inwards over the plies on said drurn. As a consequence, themarginal portion of the plates -1101 positioned from the beginning onthe drum 78 is turned over the wire bead ring 102 adjacent the fabricturnover drum 78 and inwards over the intermediate portion of the pliesbetween the bead wire rings, as is shown in FIG. 9. During its movementthe drum 78 is simultaneously expanded in the manner already describedso that the stitcher springs 83 all the time can roll on the plies onthe tire building drum 31, pressing the turned-over marginal portion ofthe plies against the intermediate portion of the plies between the beadwire rings. After the turning-over has been completed, the fabricturnover drum 78 is returned to initial position by admission ofpressure medium to the cylinder 9'1 through the aperture l93. At thesame time pressure medium is supplied to the cylinder 47 through theconnection aperture 103 so that the fabric turnover drum 71 is caused totelescope inwards over the tire building drum 31, whereby the othermarginal portion of the plies 101 is turned over the adjacent bead wirering 102 and pressed against the other maginal portion of the pliesbetween the bead wire rings as is indicated in PIG. 10. After theturning-over has been completed the fabric turnover drum 7^1 is returnedto its initial position by admission of pressure medium to the cylinder47 through the connection aperture 104. The building of the tires on thetire building drum 31 is then terminated in the ordinary manner bywrapping rubber strips forming the tread and other parts of the tireonto the tire building drum 311. Finally, the brake "9S-100 is caused tolock the drums 31, 71, 78 to the frame 11 while air under pressureissupplied to the locking mechanism 29, 242, for the release ofthe drumsfrom the shaft k14-y so that the tire building drum 31 can be collapsedto itssmallest diameter by rotation of the shaft 14 by the motor 18.After the collapsing of the tire building drum 31, the finished tire iseasily removed from the machine over the free end of the drum 71.

What we claim and desire to secure by Letters Patent is:

l. In a tire building machine, the combination of a frame, a rotatabletubular shaft extending laterally from said frame -in a cantileverfashion, an expansible tire building drum, hub means on said shaftlaterally of said' frame on which hub means said tire building drum issupported, a slotted sleeve extending from said hub means and said tirebuilding drum on the side of said drum remote from said frame andcoaxially with said shaft, a'

reciprocable rod extending from said frame coaxially through saidshaftand said sleeve, shifting means on said frame and connected to said rodfor reciprocating said rod longitudinally, an expansible tire ply fabricturnover drum surrounding said sleeve, mounting means on said rodextending through at least one slot in said slotted sleeve andconnect-ing said turnover drum and said rod for concomitant axialreciprocation, internal expansion means for said turnover drum locatedwithin said turnover. drumV turnover drum is expanded and movedtelescopically over` said tire building drum.

2. The combination as claimed in claim 1, inwhich said mounting means`for rotatably supporting said turnover drum on said rodcomprisesbearing means between said rod andsaid slotted sleeve.

CSI

3. "In a tire building machine, the combination of a frame, a rotatabletubular shaft extending laterally from said frame in a cantileverfashion, an expansible tire building drum, hub means on said shaftlaterally of said frame on which hub means said tire building drum issupported, a slotted sleeve extending from said hub means and said tirebuilding drum on the side of said drum remote from said frame andcoaxiallywith said shaft, a reciprocable rod extending from said framecoaxially through said shaft and said sleeve, shifting means on saidframe and connected to said rod -for reciprocating said rodlongitudinally, an expansible tire ply fabric turnover drum surroundingsaid sleeve, stitching means on said turnover drum at the end thereofadjacent said tire building drum and supporting that end on said tirebuilding drum, mounting means on said rod extending through at least oneslot in said slotted sleeve and connecting said turnover drum and saidrod for concomitant axial reciprocation, internal expansion means forsaid turnover drum located within said turnover drum adjacent its endremote from said frame and said tire building drum, cam follower rodswithin said turnover drum'and operating-said expansion means andextending radially of saiditurnover drum and mounted for reciprocationin the longitudinal direction of said cam follower rods in said mountingmeans, and external cam surfaces on said sleeve cooperating with saidcam follower rods, whereby, when said turnover drum is moved by saidshifting means and said rod towardslsaid,

tire building drum, said turnover drum is expanded and movedtelescopically over said tire building drum.

References Cited in the le of this patent UNITED STATES PATENTS1,759,232 Gammeter May 20, 1930 2,313,035 roth Mar. 9, 1943 2,565,071Frazier Aug. 21, 1951 2,715,933 Frazier Allg. 23, '1955/ 2,743,760Beckadolph May l, 1956 2,838,091 Kraft lune l0, 1958 3,075,570 GarrerJan. 29, 1963

1. IN A TIRE BUILDING MACHINE, THE COMBINATION OF A FRAME, A ROTATABLETUBULAR SHAFT EXTENDING LATERALLY FROM SAID FRAME IN A CANTILEVERFASHION, AN EXPANSIBLE TIRE BUILDING DRUM, HUB MEANS ON SAID SHAFTLATERALLY OF SAID FRAME ON WHICH HUB MEANS SAID TIRE BUILDING DRUM ISSUPPORTED, A SLOTTED SLEEVE EXTENDING FROM SAID HUB MEANS AND SAID TIREBUILDING DRUM ON THE SIDE OF SAID DRUM REMOTE FROM SAID FRAME ANDCOAXIALLY WITH SAID SHAFT, A RECIPROCABLE ROD EXTENDING FROM SAID FRAMECOAXIALLY THROUGH SAID SHAFT AND SAID SLEEVE, SHIFTING MEANS ON SAIDFRAME AND CONNECTED TO SAID ROD FOR RECIPROCATING SAID RODLONGITUDINALLY, AN EXPANSIBLE TIRE PLY FABRIC TURNOVER DRUM SURROUNDINGSAID SLEEVE, MOUNTING MEANS ON SAID ROD EXTENDING THROUGH AT LEAST ONESLOT IN SAID SLOTTED SLEEVE AND CONNECTING SAID TURNOVER DRUM AND SAIDROD FOR CONCOMITANT AXIAL RECIPROCATION, INTERNAL EXPANSION MEANS FORSAID TURNOVER DRUM LOCATED WITHIN SAID TURNOVER DRUM ADJACENT ITS ENDREMOTE FROM SAID FRAME AND SAID TIRE BUILDING DRUM, CAM FOLLOWER MEANSWITHIN SAID TURNOVER DRUM COOPERATING WITH SAID EXPANSION MEANS FOROPERATING SAID EXPANSION MEANS, AND CAM MEANS ON SAID SLEEVE COOPERATINGWITH SAID CAM FOLLOWER MEANS, WHEREBY WHEN SAID TURNOVER DRUM IS MOVEDBY SAID SHIFTING MEANS AND SAID ROD TOWARDS SAID TIRE BUILDING DRUM,SAID TURNOVER DRUM IS EXPANDED AND MOVED TELESCOPICALLY OVER SAID TIREBUILDING DRUM.